Tracer, just to clarify to the OP. Majority of fans come with either 3-pin motherboard connector or 4-pin molex connector. A 4-pin motherboard connector on the other hand is more rare since it usually comes with fans that are used with heatsinks. That 4-pin motherboard connector is a PWM connector, and to find such fans you have to go to specialty sites like Frozen CPU, since I've not found a fan like that on newegg. I had to do that when replacing the fan in the Tuniq Tower.
Speed fan will not control a 4-pin molex connector since it connects directly to the power supply, and there's no interaction with it through the motherboard/software.